I ran into a very strange bug/glitch/etc. with the latest update. MCX360 wanted to download the latest update. With my very slow connection, I decided to cancel the download and instead play offline. When loading my world, I was asked something about overwriting my world. I don't remember exactly what it asked. It sounded dangerous to my save file, so instead of answering "yes" or "no", I just used the guide button to exit the game. I downloaded the update and loaded my world again. It was not my world. My character didn't have any items and I was put in some strange world with fragmented terrain. My save file was corrupt and my settings were reset to their defaults.
Luckily, I have a backup. I still lost several hours of gameplay, but it's nothing huge.
I suspect this might be a related bug to the one that use to arbitrarily delete worlds when you renamed them and/or moved them about between USB and hard drive. Other people have been reporting finding themselves in worlds that no longer looked like theirs... but you're the first to have mentioned backing out of an overwrite situation. I would suggest you report this all on the TU13 official bugs threads where 4JSteven will at least be sure to read it. Great that you had the forethought to have a backup!
Forcibly quitting in the middle of an I/O operation (like downloading an update or saving a file) is dangerous. It can lead to corrupt data. That's on any computing device, not just the Xbox.
When you save a game this message comes up: "Are you sure you want to overwrite any previous save for this world with the current version of this world?"
That is a standard message that appears everytime. It's just a failsafe to keep you from accidentally overwriting a world with a griefed save or something. If you answer 'no' then you are not saving the current world and your world will revert to the last 'save' when reloaded.
The rest of what you said did seem like a corrupted file as suggested previously.
Luckily, I have a backup. I still lost several hours of gameplay, but it's nothing huge.
If you still have the broken world...I must see it....
Stay fluffy~
I overwrote it with my backup.
That is a standard message that appears everytime. It's just a failsafe to keep you from accidentally overwriting a world with a griefed save or something. If you answer 'no' then you are not saving the current world and your world will revert to the last 'save' when reloaded.
The rest of what you said did seem like a corrupted file as suggested previously.